<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <input v-model = "val" type="text">
        <button @click = "addItem">添加</button>
        <div>
            <h2>
                正在进行 --- {{ len }}
            </h2>
            <ul>
                <li v-for="(item,index) in arr"  v-show = "!item.checked">
                    <input v-model = "item.checked" type="checkbox">
                    {{ item.val }}
                    <button @click = "del(index)">删除</button>
                </li>
            </ul>
            <h2>
                已经完成  --- {{ arr.length - len }}
            </h2>
            <ul>
                 <li v-for="(item,index) in arr" v-show = "item.checked">
                    <input v-model = "item.checked" type="checkbox">
                    {{ item.val }}
                    <button>删除</button>
                </li>
            </ul>
        </div>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        new Vue({
            el:"#app",
            data:{
                //input中输入的值
                val:"",
                //总的任务
                arr:[]
            },
            created(){

            },
            computed:{
                len(){
                    return this.arr.filter( (item) => {
                        return item.checked === false
                    }).length
                }
            },
            methods:{
                addItem(){
                    this.arr.push({
                        val:this.val,
                        checked:false
                    })
                    this.val = ""
                },
                del(index){
                    this.arr.splice(index,1);
                    console.log(index)
                }
            }
        })
    </script>
</body>
</html>